In Mega Man Star Force 3 it is changed to the Cipher Code (暗号コード,Cipher Code?) system, the code being given to Ken Suther's Wizard, Hang Ten, instead of being sent by mail. Hang Ten needs Cipher Codes to master giant Noise Waves in the EM ocean.

Mega Man Star Force 3

All codes in the third game are made of a Greek letter followed by five number. The codes are the same in the Japanese version, but with the Greek letters written in Japanese: アルファ, ベータ, ガンマ, デルタ, イプシロン, ゼータ, イータ, シータ, イオタ, カッパ, ラムダ, ミュー, ニュー, クサイ, オミクロン, パイ, ロー, シグマ, タウ, ユプシロン, ファイ, カイ, プサイ, and オメガ.